I know that there is a very similar question, but I'm not interested in highlighting. What I'm looking for is some tool in Linux to edit pdf files. I've tried pdfedit which did the work for me, but if freezes after a few edits. I've tried this tool under Ubuntu 9.10 and under KDE Fedora 14 and the same thing happens. I've tried Okular but the notations are too big to fill out exercises from pdf workbooks.

Is there any tool that suits this job? I don't care whether it is open source or I have to pay a reasonable price for it.

Simple, but works nicely and smoothly. After you type your annotation it's easy to place it in the right place. It also respected the document layout.
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ChuckDec 8 '10 at 20:23

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I can't say I agree with Chuck. I found flpsed to be very slow and most importantly not very gracious in handling PDF files. Exported documents are saved as bitmaps and loose all vector and text information.
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GlutanimateApr 18 '13 at 6:59

+1 for Xournal - what a nice tool! I like it!!!
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B. RolandApr 4 '11 at 19:30

calibre's conversion from PDF to RTF failed to reproduce the lines delineating tabular data. This is important since many of the PDF forms that users need to edit, or "fill in", will have grid lines.
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H2ONaClOct 7 '12 at 6:56

Thank you, it seems to be working so far. It opens the file with Draw though.
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ChuckDec 8 '10 at 17:29

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You should pay attention to big tables incorporated in PDF files. A PDF Import Extension sometimes make some shifts (position distorsion) in text or tables structure.
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VincenzoDec 8 '10 at 18:18

Yeah, there are two details to keep in mind with this extension. First, it changed the document layout because of position shifting. Second, when using Draw to fill out some documents it's hard to position the text in the right place.
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ChuckDec 8 '10 at 20:18

In Ubuntu 12.04: sudo apt-get install libreoffice-pdfimport.Worked very well for me indeed, allowing me to fill-in a pseudo-form (word-created form for humans, not a real pdf form) exactly at the right places by selecting the line of placeholder dots in the pdf. Better than a typewriter.
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mivkApr 19 '13 at 18:33

PDF Mod is a simple tool for modifying PDF documents. It can rotate, extract, remove and reorder pages via drag and drop. Multiple documents may be combined via drag and drop. You may also edit the title, subject, author and keywords of a PDF document using PDF Mod.

sudo apt-get install pdfmod

Note: this application may require quite a few dependencies related to mono.

Master PDF Editor is excellent! we can select and move all elements on the page! But they broke the latest 1.9.24 version... making it fail to load all images. But the 1.9.00 version works very fine! but there is no download link anymore... so found we can download it directly from here 64bits or here 32bits.
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Aquarius PowerApr 1 '14 at 18:12

...we can actually edit all elements on the page
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Aquarius PowerApr 1 '14 at 18:18

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I like the tool. Ubuntu One commerce site is confusing though: it states that this is a free download, yet after downloading it says "Thank you for your purchase." I have no idea if I was charged for it, and if I was, how much.
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BramMay 28 '14 at 17:46

Personally, I tried PDF Studio and I must admit it looks original Acrobat on its features (the gui, however, is not fantastic).

The only flaw is that it is not free, but I did not regret what I spent (much less than it costs Acrobat, however). Tested on Mint and Ubuntu and it works great! If you want to be picky, the tool "Text" is limited and the interface is less rational than Acrobat's, but all in all, I would say that it is a great substitute.

One last tip: if you do not hurry, version 9 should be out in March, with many other new interesting features. The most important for me is to allow OCR for pages that already have some text content included.